22 prominent Canadians, including 4 former Prime Ministers, have issued a letter demanding oversight over Canada’s national police force and spy agency, ahead of the Harper Government’s sweeping Anti-terrorism Bill.

The group includes former Supreme Court Justices, Justice ministers, Solicitor Generals, privacy commissioners, members of security and intelligence review committees, and former Prime Ministers Jean Chretien, Joe Clark, Paul Martin, and John Turner among others.

In the letter, the group says a lack of oversight of both CSIS and the RCMP poses a serious problem for public safety and human rights.